internal static UIntPtr UserAllocate(UIntPtr numPages,
Process process,
uint extra,
PageType type)
{
UIntPtr result = UIntPtr.Zero;
if (useAddressTranslation)
{
result = ProtectionDomain.CurrentDomain.UserRange.Allocate(
numPages, process, extra, type);
}
else
{
result = FlatPages.Allocate(BytesFromPages(numPages),
UIntPtr.Zero,
MemoryManager.PageSize,
process, extra, type);
}
if (result == UIntPtr.Zero)
{
UserMemoryFailure();
}
return(result);
}
internal static UIntPtr KernelAllocate(UIntPtr numPages, Process process,
uint extra, PageType type)
{
UIntPtr result = UIntPtr.Zero;
if (useAddressTranslation)
{
if (KernelRangeWrapper != null)
{
result = KernelRangeWrapper.Allocate(numPages, process, extra, type);
}
else
{
// Very early in the initialization sequence; ASSUME there is not
// yet any concurrent access to paging descriptors, and allocate
// memory without a paging-descriptor lock.
result = KernelRange.Allocate(numPages, process, extra, type, null);
}
}
else
{
result = FlatPages.Allocate(BytesFromPages(numPages),
UIntPtr.Zero,
MemoryManager.PageSize,
process, extra, type);
}
if (result == UIntPtr.Zero)
{
DebugStub.WriteLine("******** Kernel OOM on Heap ********");
//
// Our kernel runtime can not handle this right now, so rather than
// return a null which will show up as a cryptic lab failure, always
// drop to the debugger.
//
DebugStub.Break();
}
return(result);
}
internal static UIntPtr AllocateIOMemory(UIntPtr limitAddr,
UIntPtr bytes,
UIntPtr alignment,
Process process)
{
UIntPtr result = UIntPtr.Zero;
if (useAddressTranslation)
{
result = KernelIOMemoryHeap.Allocate(limitAddr, bytes, alignment, process);
}
else
{
if (limitAddr > 0)
{
result = FlatPages.AllocateBelow(limitAddr, bytes, alignment, process, 0, PageType.NonGC);
}
else
{
result = FlatPages.Allocate(bytes, bytes, alignment, process, 0, PageType.NonGC);
}
}
if (result == UIntPtr.Zero)
{
DebugStub.WriteLine("******** Kernel OOM on IoMemory ********");
//
// Our kernel runtime can not handle this right now, so rather than
// return a null which will show up as a cryptic lab failure, always
// drop to the debugger.
//
DebugStub.Break();
}
return(result);
}